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<h1 id="page-title" class="page">DaoAuthenticationProvider</h1>
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<p><a href="https://docs.spring.io/spring-security/site/docs/current/api/org/springframework/security/authentication/dao/DaoAuthenticationProvider.html"><code>DaoAuthenticationProvider</code></a> is an <a href="../architecture.html#servlet-authentication-authenticationprovider" class="xref page"><code>AuthenticationProvider</code></a> implementation that leverages a <a href="user-details-service.html#servlet-authentication-userdetailsservice" class="xref page"><code>UserDetailsService</code></a> and <a href="password-encoder.html#servlet-authentication-password-storage" class="xref page"><code>PasswordEncoder</code></a> to authenticate a username and password.</p>
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<p>Let&#8217;s take a look at how <code>DaoAuthenticationProvider</code> works within Spring Security.
The figure explains details of how the <a href="../architecture.html#servlet-authentication-authenticationmanager" class="xref page"><code>AuthenticationManager</code></a> in figures from <a href="index.html#servlet-authentication-unpwd-input" class="xref page">Reading the Username &amp; Password</a> works.</p>
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<div class="title">Figure 1. <code>DaoAuthenticationProvider</code> Usage</div>
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<p><span class="image"><img src="../../../_images/icons/number_1.png" alt="number 1"></span> The authentication <code>Filter</code> from <a href="index.html#servlet-authentication-unpwd-input" class="xref page">Reading the Username &amp; Password</a> passes a <code>UsernamePasswordAuthenticationToken</code> to the <code>AuthenticationManager</code> which is implemented by <a href="../architecture.html#servlet-authentication-providermanager" class="xref page"><code>ProviderManager</code></a>.</p>
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<p><span class="image"><img src="../../../_images/icons/number_2.png" alt="number 2"></span> The <code>ProviderManager</code> is configured to use an <a href="../architecture.html#servlet-authentication-authenticationprovider" class="xref page">AuthenticationProvider</a> of type <code>DaoAuthenticationProvider</code>.</p>
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<p><span class="image"><img src="../../../_images/icons/number_3.png" alt="number 3"></span> <code>DaoAuthenticationProvider</code> looks up the <code>UserDetails</code> from the <code>UserDetailsService</code>.</p>
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<p><span class="image"><img src="../../../_images/icons/number_4.png" alt="number 4"></span> <code>DaoAuthenticationProvider</code> then uses the <a href="password-encoder.html#servlet-authentication-password-storage" class="xref page"><code>PasswordEncoder</code></a> to validate the password on the <code>UserDetails</code> returned in the previous step.</p>
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<p><span class="image"><img src="../../../_images/icons/number_5.png" alt="number 5"></span> When authentication is successful, the <a href="../architecture.html#servlet-authentication-authentication" class="xref page"><code>Authentication</code></a> that is returned is of type <code>UsernamePasswordAuthenticationToken</code> and has a principal that is the <code>UserDetails</code> returned by the configured <code>UserDetailsService</code>.
Ultimately, the returned <code>UsernamePasswordAuthenticationToken</code> will be set on the <a href="../architecture.html#servlet-authentication-securitycontextholder" class="xref page"><code>SecurityContextHolder</code></a> by the authentication <code>Filter</code>.</p>
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